I don’t think the materials you are talking about fit historical restoration. As for the Russians and construction expertise, especially in timber construction google Transfiguration Church to start with. 150 ft high and standing strong since 1714. Built in place of identical structure burned by the lightning and standing for centuries before. Not a single nail was used to erect it. There is a national park near Archangelsk in Russia with a collection of ancient timber buildings moved there from all around Russian northwest. If you know a thing about carpeting the sophistication of these structures would amaze you especially in light of how old they are.
Study up on the 1200 year old beams that burned— the size of them in what is called “The Forest” arrayed in amazing force diagram supports of the 750 tons of lead roofing that collapsed from the complete burn through of the timbers (and the similarly clad wooden spire).
There is simply no wood of this size and density to “restore” the beams. Not any more and not in the hardwoods. Maybe some firm could make giant ply-timbers to duplicate and thus give “natural” like restoration. Who knows. There are marvelous online photos (architectural ones) of all of the roof braces— and they are post and peg construction similar to the construction of the log homes having lived in Aspen and elsewhere. So do have understanding of what you describe in Russia. The dendrologists of the archival historians of the Cathedral id’d the wood of the support beams as “harvested in 8th or 9th Century” and stored/not used until 1160, having grown for 300 years before harvest in the first place. Am following all this through my architect friends.